[PATCH v2 3/6] prctl.2: Add PR_SPEC_DISABLE_NOEXEC for SPECULATION_CTRL prctls
From: Dave Martin <Dave.Martin@arm.com>
Date: 2020-05-27 21:19:18
Also in:
linux-arch, linux-man
Subsystem:
the rest · Maintainer:
Linus Torvalds
Add the PR_SPEC_DISABLE_NOEXEC mode added in Linux 5.1 for the PR_SPEC_STORE_BYPASS "misfeature" of PR_SET_SPECULATION_CTRL and PR_GET_SPECULATION_CTRL. Signed-off-by: Dave Martin <Dave.Martin@arm.com> Cc: Waiman Long <longman@redhat.com> Cc: Thomas Gleixner <redacted> --- man2/prctl.2 | 22 ++++++++++++++++++++-- 1 file changed, 20 insertions(+), 2 deletions(-)
diff --git a/man2/prctl.2 b/man2/prctl.2
index b6fb51c..cab9915 100644
--- a/man2/prctl.2
+++ b/man2/prctl.2@@ -1187,6 +1187,12 @@ The speculation feature is disabled, mitigation is enabled. Same as .B PR_SPEC_DISABLE but cannot be undone. +.TP +.BR PR_SPEC_DISABLE_NOEXEC " (since Linux 5.1)" +Same as +.BR PR_SPEC_DISABLE , +but but the state will be cleared on +.BR execve (2). .RE .IP If all bits are 0,
@@ -1251,6 +1257,17 @@ with the same value for .I arg2 will fail with the error .BR EPERM . +.\" commit 71368af9027f18fe5d1c6f372cfdff7e4bde8b48 +.TP +.BR PR_SPEC_DISABLE_NOEXEC " (since Linux 5.1)" +Same as +.BR PR_SPEC_DISABLE , +but but the state will be cleared on +.BR execve (2). +Currently only supported for +.I arg2 +equal to +.B PR_SPEC_STORE_BYPASS. .RE .IP Any unsupported value in
@@ -1899,11 +1916,12 @@ was .BR PR_SET_SPECULATION_CTRL and .IR arg3 -is neither +is not .BR PR_SPEC_ENABLE , .BR PR_SPEC_DISABLE , +.BR PR_SPEC_FORCE_DISABLE , nor -.BR PR_SPEC_FORCE_DISABLE . +.BR PR_SPEC_DISABLE_NOEXEC . .SH VERSIONS The .BR prctl ()
--
2.1.4
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